The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

The Morning Star

combinatorics, data structures, geometry, implementation, math, sortings

We Were Both Children

brute force, implementation, math, number theory

Cardboard for Pictures

binary search, geometry, implementation, math

Balanced Round

brute force, greedy, implementation, sortings

Word on the Paper

implementation, strings

Ten Words of Wisdom

implementation, sortings

To My Critics

implementation, sortings

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Array Painting

constructive algorithms, greedy, two pointers

Binary String Copying

binary search, brute force, data structures, hashing, strings

Monsters

greedy, math, sortings

Morning Sandwich

implementation, math

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Vika and Stone Skipping

brute force, implementation, math, number theory

Vika and Bonuses

binary search, brute force, math, ternary search

Vika and Price Tags

math, number theory

Vika and the Bridge

binary search, data structures, greedy, implementation, math, sortings

Vika and Her Friends

games, math

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Triangle Platinum?

brute force, combinatorics, implementation, interactive, math, probabilities

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Hamon Odyssey

bitmasks, greedy, two pointers

The Man who became a God

greedy, sortings

Rudolf and CodeVid-23

bitmasks, dp, graphs, greedy, shortest paths

Rudolph and Mimic

constructive algorithms, implementation, interactive

Rudolf and Snowflakes (hard version)

binary search, brute force, implementation, math

Rudolf and Snowflakes (simple version)

brute force, implementation, math

Rudolph and Christmas Tree

constructive algorithms, geometry, math

Rudolf and the Another Competition

constructive algorithms, data structures, dp, greedy, sortings

Rudolph and Tic-Tac-Toe

brute force, implementation, strings

Rudolph and Cut the Rope

implementation, math

Swimmers in the Pool

dp, fft, math, number theory

Boxes and Balls

dp, implementation, math

Rating System

binary search, brute force, data structures, dp, dsu, greedy, math, two pointers

Strong Password

binary search, dp, greedy, strings

Come Together

geometry, implementation, math

Forbidden Integer

constructive algorithms, implementation, math, number theory

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Min Cost Permutation (Hard Version)

binary search, constructive algorithms, data structures, greedy, math, sortings

Min Cost Permutation (Easy Version)

brute force, constructive algorithms, greedy, math

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

Row Major

constructive algorithms, greedy, math, number theory, strings

Particles

dp, greedy, implementation, math

Permutations & Primes

constructive algorithms, math

Subtraction Game

constructive algorithms, games

Omsk Metro (hard version)

data structures, dfs and similar, divide and conquer, dp, math, trees

Omsk Metro (simple version)

data structures, dfs and similar, dp, graphs, greedy, math, trees

Tracking Segments

binary search, brute force, data structures, two pointers

Apple Tree

combinatorics, dfs and similar, dp, math, trees

Sum in Binary Tree

bitmasks, combinatorics, math, trees

Long Long

greedy, math, two pointers

Sasha and Array Coloring

greedy, sortings, two pointers

Tenzing and Necklace

divide and conquer, dp, greedy

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Tenzing and Random Operations

combinatorics, dp, math, probabilities

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Tenzing and His Animal Friends

constructive algorithms, graphs, greedy

Tenzing and Balls

dp

Tenzing and Books

bitmasks, greedy, math

Tenzing and Tsondu

games, math

Monocarp and a Strategic Game

geometry, sortings, two pointers

Fill the Matrix

data structures, greedy, math

Pairs of Segments

data structures, greedy, sortings, two pointers

Ranom Numbers

brute force, dp, greedy, math, strings

Keep it Beautiful

implementation

Game with Board

constructive algorithms, games

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

In Search of Truth (Easy Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Railguns

brute force, dfs and similar, dp, graphs

Character Blocking

data structures, hashing, implementation

Wooden Toy Festival

binary search, greedy, sortings

Ski Resort

combinatorics, math, two pointers

Binary Cafe

bitmasks, combinatorics, math

Cipher Shifer

implementation, strings, two pointers

Decreasing Game

constructive algorithms, dfs and similar, dp, greedy, interactive

Ball Sorting

data structures, dp, sortings

Insert Zero and Invert Prefix

constructive algorithms

Lamps

greedy, sortings

The Good Array

greedy, implementation, math

Stuck Conveyor

binary search, constructive algorithms, interactive

Count Supersequences

combinatorics, dp, math

Bracket Walk

data structures, greedy, strings

No Prime Differences

constructive algorithms, math, number theory

Minimize Permutation Subarrays

constructive algorithms, math

Blackboard List

constructive algorithms, math

Editorial for Two

binary search, data structures, greedy, implementation

Playoff Fixing

combinatorics, trees

Bracket Coloring

constructive algorithms, greedy

Best Binary String

constructive algorithms, greedy

Comparison String

greedy

Grasshopper on a Line

constructive algorithms, math

Astrophysicists

greedy, math

Destroyer

implementation, sortings

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Old Mobile

combinatorics, dp, probabilities